\\[-1.8ex] Soil Heterogeneity & $-$4.389$^{***}$ & $-$5.635$^{***}$ & $-$4.188$^{***}$ & $-$4.509$^{***}$ & $-$2.891$^{***}$ & $-$2.711$^{***}$ & $-$2.882$^{***}$ & $-$1.706$^{**}$ & $-$1.927$^{**}$ \\ 
  & (1.244) & (1.731) & (1.301) & (1.221) & (1.087) & (0.925) & (0.910) & (0.805) & (0.820) \\ 
  & & & & & & & & & \\ 
\hline \\[-1.8ex]  \\[-1.8ex] 
Dependent Variable Mean & 65.95 & 69.68 & 69.44 & 68.79 & 68.46 & 67.84 & 67.32 & 66.78 & 66.54 \\ 
Dependent Variable SD & 6.49 & 8.16 & 7.84 & 7.54 & 5.97 & 5.14 & 5.22 & 4.93 & 5.02 \\ 
Observations & 1,608 & 2,031 & 2,242 & 2,526 & 2,819 & 2,949 & 3,065 & 3,098 & 3,099 \\ 
R$^{2}$ & 0.665 & 0.560 & 0.619 & 0.606 & 0.567 & 0.511 & 0.535 & 0.481 & 0.512 \\ 
